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Tendril-less regulates tendril formation in pea leaves


Hofer, J and Turner, L and Moreau, C and Ambrose, M and Isaac, P and Butcher, S and Weller, JL and Dupin, A and Dalmais, M and Le Signor, C and Bendahmane, A and Ellis, N, Tendril-less regulates tendril formation in pea leaves, Plant Cell, 21, (2) pp. 420-428. ISSN 1040-4651 (2009) [Refereed Article]

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© 2009 American Society of Plant Biologists

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DOI: doi:10.1105/tpc.108.064071


Tendrils are contact-sensitive, filamentous organs that permit climbing plants to tether to their taller neighbors. Tendrilled legume species are grown as field crops, where the tendrils contribute to the physical support of the crop prior to harvest. The homeotic tendril-less (tl) mutation in garden pea (Pisum sativum), identified almost a century ago, transforms tendrils into leaflets. In this study, we used a systematic marker screen of fast neutron–generated tl deletion mutants to identify Tl as a Class I homeodomain leucine zipper (HDZIP) transcription factor. We confirmed the tendril-less phenotype as loss of function by targeting induced local lesions in genomes (TILLING) in garden pea and by analysis of the tendril-less phenotype of the t mutant in sweet pea (Lathyrus odoratus). The conversion of tendrils into leaflets in both mutants demonstrates that the pea tendril is a modified leaflet, inhibited from completing laminar development by Tl. We provide evidence to show that lamina inhibition requires Unifoliata/LEAFY-mediated Tl expression in organs emerging in the distal region of the leaf primordium. Phylogenetic analyses show that Tl is an unusual Class I HDZIP protein and that tendrils evolved either once or twice in Papilionoid legumes. We suggest that tendrils arose in the Fabeae clade of Papilionoid legumes through acquisition of the Tl gene.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Grain legumes
UTAS Author:Weller, JL (Associate Professor Jim Weller)
ID Code:60716
Year Published:2009
Web of Science® Times Cited:91
Deposited By:Plant Science
Deposited On:2010-02-16
Last Modified:2011-07-28

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